libADLMIDI + raylib example

adlmidi_raylib_test.c

#include <adlmidi.h>
#include <raylib.h>
#include <stdio.h>

#define MAX_SAMPLES_PER_UPDATE 4096

static struct ADL_MIDIPlayer *midi_player;
static struct ADLMIDI_AudioFormat adl_audio_format = {
    ADLMIDI_SampleType_F32,
    sizeof(float),
    sizeof(float) * 2,
};

void AudioInputCallback(void *buffer, unsigned int frames)
{
    adl_playFormat(midi_player, frames * 2, (ADL_UInt8 *)buffer, (ADL_UInt8 *)buffer + adl_audio_format.containerSize, &adl_audio_format);
}

int main(void)
{
    int err = 0;

    midi_player = adl_init(44100);

    if (!midi_player)
    {
        fprintf(stderr, "Couldn't initialize ADLMIDI: %s\n", adl_errorString());
        return 1;
    }

    adl_switchEmulator(midi_player, ADLMIDI_EMU_NUKED);
    adl_setNumChips(midi_player, 2);
    adl_setBank(midi_player, 72);
    adl_setLoopEnabled(midi_player, 1);

    if (adl_openFile(midi_player, "dd3level1b.mid") < 0)
    {
        fprintf(stderr, "Couldn't open music file: %s\n", adl_errorInfo(midi_player));
        err = 1;
        goto close;
    }

    const int screenWidth = 800;
    const int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw audio streaming");

    InitAudioDevice();

    SetAudioStreamBufferSizeDefault(MAX_SAMPLES_PER_UPDATE);

    // sample rate: 44100, sample size: 32 bits, 2 channels (stereo)
    AudioStream stream = LoadAudioStream(44100, 32, 2);

    SetAudioStreamCallback(stream, AudioInputCallback);

    PlayAudioStream(stream);

    while (!WindowShouldClose())
    {
        BeginDrawing();
            ClearBackground(RAYWHITE);
        EndDrawing();
    }

close:
    UnloadAudioStream(stream);
    CloseAudioDevice();

    adl_close(midi_player);

    CloseWindow();

    return err;
}